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Finding the Fourth Proportional to 1,322.40, 1,983.74 and 348.58

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Solution

The fourth proportional to 1,322.40, 1,983.74 and 348.58 is: 522.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.40 : 1,983.74 = 348.58 : x
  2. Step 2: Convert to fraction form
    1,322.40/1,983.74 = 348.58/x
  3. Step 3: Cross multiply
    1,322.40x = 1,983.74 × 348.58
  4. Step 4: Simplify right side
    1,322.40x = 691,485.39
  5. Step 5: Solve for x
    x = 691,485.39/1,322.40
  6. Step 6: Final answer
    x = 522.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.